Electric soldering iron



W. A. BRAUN.

ELECTRTC SOLDERING LEON.

APPLICATION HLED ocT.22,1919.

lPatented Feb. 28, 1922.

2 SHEETS-SHEET l.

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" i M ATTORNEY Patented. Feb. 28, 1922.

2 SHEETS-SHEET 2.

W. A. BRAUN.

ELECTRIC SOLDERING IRON.

' APPLICATION FILED ocl 22, 1919. 1,407,722I

@ z/'vvfNToR ATTORNEY.

PATENT OFFICE.

WILLIAM A. BRAUN, 0F DOVER, 0R10.

ELECTRIC vS0LDERIN'GI- IRON.

Specification of Letters Patent.

Patented lFeb. 28, 1922o Animation filed october 22, i919. seriai No. 332,503.

To all whom t may concern.'

Be it known that I, lVILLiAM A. BRAUN, a citizen of the United States of America, and resident of Dover, in the county of rl`uscarawas and State of Ohio, have invented certain new and useful improvements in Electric Soldering' Irons, of which the following is a specication.

, llhis invention relates to improvements in electrical soldering irons, and the objects thereof are to construct the device so that its various parts maybe disassembled and the soldering point and the heating element replaced by renewal parts as occasion may arise; to so arrange the heating element and control-the current for exciting it that several different degrees of heat may be maintained as required; and to provide means for automatically controlling the current utilized in attaining the greater degrees of heat.

A further object is to provide an electrical soldering iron so constructed that it may be kept in a moderately heated state while awaiting use and which will automatically become heated to a degree for practical use when lifted by the operator. rlhe objects of the invention are accomplished by the construction illustrated in the accompanying drawings in which Figure 1 is a side elevation of the'head of a soldering iron partially in central section;

Fig. 2 is a similar view of the handle for the soldering iron showing the switch for controlling one of the electrical heating circuits; and

F ig. 3 is a side. elevation of the head oft a soldering iron with parts thereof cut away and in section showing another arrangement of the heating elements.

Similar characters of reference indicate corresponding parts in both views and referring now to the same 1 is a soldering` core', the shank 2 of which extends into a shell 3, the/shank having a threaded extension at its lower extremity that is engaged in the corresponding end of the shell. In making the shell a non-oxidizing metal is used so that the shank of the solderin core will Ifot became imbedded with oxide within thelshell and thereby be prevented from'being easily withdrawn.

The upper end of the shell has an external flange 5, to which is secured a casing 6, and to the opposite end ofthe casing is secured a cap T into which extends a tube 8 for supporting the soldering iron.

Aaround the shell 3 is a coating 9 of insulating material through which the terminal wires 10 and 11 extend, and an outer layer 12 of cement or other insulating material extends around the former layer and contains the inner and outer heating coils 13 and 1% respectively. The outer layer 12 of cement is surrounded by anxasbestos covering 15 which lies adjacent the inner wall 0f the casing.

To the lower end of the supporting tube 8 is secured a hollow handle 16 in one side of which is hinged a switch-lever 17 that normally projects outwardly from the handle, a spring-plate 18 secured within the handle and attached to the lever serving as a hinge. switch member 19 is secured within the handle and a co-operating switch member 20 is secured to the inner side of the lever 17 so that when the lever is pressed inwardly the switch members become engaged in contact with each other.

Electrical feed wires 21 and 22 have respective connections with a terminal block 23 within the handle, and the feed wire 22 has connection directly with each of the heating coils 13 and 14; through the medium of the terminal wires 10 and 11 and the connecting wire 211. The inner heating coil 13 has connection with the feed wire 21 and also with the switch member 20, through the medium of the connecting wire 25, and the outer heating coil 14 has connection with the switch member 19 through the medium of the connecting wire 26.

ln the form shown in Fig. 3 two heating elements 27 and 28 are imbedded in a layer of cement 12 that surrounds the shell 3', the elements being arranged with the coils of one intervening between those of the otherand both having connection at their lower ends with a connecting wire 24. One of the elements has connection at its opposite end with a connecting wire 25 and the other element has similar connection with a connecting wire 26, each of the connecting wires being continuations respectively of the connecting wires 24:, 25 and 26 shown in- F ig. 2, so that electrical current is applied to the elements and controlled in similar manner to the foregoing instance. B arranging the elements so that the coils one intervene between those of the other ofy admits; of winding both elements in close proximity to the shell with correspondingly increased eilicient result.

In the operation of the invention, when current is supplied through the feed wires, one heating coil becomes active and the soldering core consequently becomes heated,

the latter being so proportioned that the.

degree of heat attained by it will be insufiicient to injure the heating element even though its attained temperature be protracted ndeinitely. When the operator grasps the handle, the lever thereby becomes moved inwardly so that the switch members become closed into contact with each other, thus closing the electrical circuit through the other heating coil whereupon it also becomes active and the heat ot' the soldering core becomes intensified so that the iron becomes sufficiently heated for use. As the operator lays the instrument down and releas this grasp of the handle the switch-lever is moved outwardly by the spring hinge, thus parting the switch members so that the circuit through they outer heating coil is broken.

The connections ot the two heating coils with the feed-wires are in multiple so that the operation or discontinuation of one heating coil effects no interruption of the other heating coil. By the arrangement herein disclosed the soldering iron becomes heated to the high degree necessary for operation Aonly at such times as it 1s being actively applied and is maintained ina more moderately heated state while awaiting use. In this manner the life of the instrument is 'the shell; two separate heating coils posi tioned around the shell; a handle including means Jfor supporting the shell; a switch lever in hinged connection with the handle and forming a movable part thereof; a pair ot' switch members, one having connection with the lever and the other with the handle proper and being adapted. to be brou ht together by. movement of the lever; an eedwires having direct means of connection with one of said heating -coils and through the medium of said switch members with the other heating coil.

Q. In an electrical soldering iron including a soldering core and supporting handle; two separate resistance coils for heating the core; la lever having hinged connection with the handle adapted to be actuated by the operator in grasping the handle; a switch adapted to be closed when the lever is actuated; and electrical means for constantly maintaining current through one of said coils and intermittingly through the other coil governable by the switch.

In testimony whereof I affix my signature, in presence of two witnesses.

WILLIAM A. BRAUN.

Witnesses F. I-I. VALDRON, V V. BREMYER. 

